Stcrage battery



H. ...5. AKER STORAGE BATTERY Filfac Marsh 28, R9223- mentioned helical surface eonsttuting hhe ower ieee of S21-1d nut thread, and a Surface lnelmed te the last menflene helea surface constituting the upper Suffece of Said nut ueud.; the construction being Such that. sani nui; and pest when m elampmg relatlon Shall. have eou'uuzb only between he uppe Leeefztee surface of the nut thread and the lower surface of @he post thread and at the roots of said threads. 1Q

In testimony whereof, ax my signa- HARRY J. BAKER 

